After opening embedded Unity fragment, resolution changes in parent Android app

I have a Unity activity embedded as a fragment inside of my Android app. Everything works fine, except that after the fragment runs, the resolution of the app is funny. And it stays that way even after restarting. I have to make a change to the AndroidManifest and then reinstall in order to get the resolution right again.

Here is a piece of the manifest from the Android app.

<application
    android:name=".App"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:extractNativeLibs="true"
    android:theme="@style/AppTheme"
    android:usesCleartextTraffic="true">
    <activity android:name=".FragmentActivity"
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:windowSoftInputMode="adjustNothing">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

Here is the entire AndroidManifest from unityLibrary that I imported into the app.

<?xml version="1.0" encoding="utf-8"?>
<!-- GENERATED BY UNITY. REMOVE THIS COMMENT TO PREVENT OVERWRITING WHEN EXPORTING AGAIN-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.unity3d.player" xmlns:tools="http://schemas.android.com/tools">
  <application>
    <activity android:name="com.unity3d.player.UnityPlayerActivity" android:theme="@style/UnityThemeSelector" android:screenOrientation="fullSensor" android:configChanges="mcc|mnc|locale|touchscreen|keyboard|keyboardHidden|navigation|orientation|screenLayout|uiMode|screenSize|smallestScreenSize|fontScale|layoutDirection|density" android:hardwareAccelerated="false">
     <!--<intent-filter>-->
        <!--<action android:name="android.intent.action.MAIN" />-->
        <!--<category android:name="android.intent.category.DEFAULT" />-->
      <!--</intent-filter>-->
      <meta-data android:name="unityplayer.UnityActivity" android:value="true" />
      <meta-data android:name="android.notch_support" android:value="true" />
    </activity>
    <meta-data android:name="unity.splash-mode" android:value="0" />
    <meta-data android:name="unity.splash-enable" android:value="True" />
    <meta-data android:name="notch.config" android:value="portrait|landscape" />
    <meta-data android:name="unity.build-id" android:value="f6e555a5-44fc-47be-9a81-b3809caa8f74" />
  </application>
  <uses-feature android:glEsVersion="0x00030000" />
  <uses-feature android:name="android.hardware.vulkan.version" android:required="false" />
  <uses-feature android:name="android.hardware.touchscreen" android:required="false" />
  <uses-feature android:name="android.hardware.touchscreen.multitouch" android:required="false" />
  <uses-feature android:name="android.hardware.touchscreen.multitouch.distinct" android:required="false" />
</manifest>

Here's the activity that holds the fragment.

class FragmentActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_fragment)

    }
}

Here's the fragment itself.

class UnityFragment : Fragment() {
    protected var mUnityPlayer: UnityPlayer? = null
    var frameLayoutForUnity: FrameLayout? = null

    fun UnityFragment() {}

    override fun onCreateView(
            inflater: LayoutInflater, container: ViewGroup?,
            savedInstanceState: Bundle?
    ): View? {
        mUnityPlayer = UnityPlayer(activity)
        val view = inflater.inflate(R.layout.fragment_unity, container, false)
        frameLayoutForUnity =
                view.findViewById<View>(R.id.frameLayoutForUnity) as FrameLayout
        frameLayoutForUnity!!.addView(
                mUnityPlayer!!.view,
                FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT
        )
        mUnityPlayer!!.requestFocus()
        mUnityPlayer!!.windowFocusChanged(true)
        return view
    }

    override fun onDestroy() {
        mUnityPlayer!!.quit()
        super.onDestroy()
    }

    override fun onPause() {
        super.onPause()
        mUnityPlayer!!.pause()
    }

    override fun onResume() {
        super.onResume()
        mUnityPlayer!!.resume()
    }
}

And here's R.layout.fragment_unity.

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/frameLayoutForUnity"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".UnityFragment"/>

The layout for FragmentActivity is just a single fragment inside of a constraintlayout.

I hope someone can point me in the right direction because I really don't understand how screen resolution works or what controls it. But based on the appearance of layouts in the rest of the app, it feels like that's what it's related to.